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Research Papers

Modeling and Analysis of an Offshore Wind Turbine With Fluid Power Transmission for Centralized Electricity Generation

[+] Author and Article Information
Antonio Jarquin Laguna

Offshore Engineering Section,
Delft University of Technology,
Delft 2628CN, The Netherlands
e-mail: A.JarquinLaguna@tudelft.nl

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received October 30, 2013; final manuscript received July 25, 2014; published online April 2, 2015. Assoc. Editor: Carlo L. Bottasso.

J. Comput. Nonlinear Dynam 10(4), 041002 (Jul 01, 2015) (14 pages) Paper No: CND-13-1263; doi: 10.1115/1.4028110 History: Received October 30, 2013; Revised July 25, 2014; Online April 02, 2015

This paper presents a mathematical model of an innovative offshore wind turbine with fluid power transmission. The proposed concept is a variable-speed, pitch controlled turbine which differs from conventional technology by using fluid power technology as a medium to transfer the energy from the wind. The final aim is to use several turbines to centralize electricity generation. Unlike conventional variable speed concepts, the proposed turbine comprises a passive-torque control method which allows the turbine to operate at optimal aerodynamic performance for different wind speeds. A numerical model of a single turbine is developed and time-domain simulations are used to analyze the dynamic response of the different operational parameters to a turbulent wind speed input. The results are compared with those of a reference offshore wind turbine with similar characteristics. It is shown that operation below rated wind speed with a passive control is possible for a single turbine with a better dynamic performance than the reference in terms of transmission torque. However, the efficiency of the energy transmission is reduced throughout the operational range. The addition and simulation of more turbines to the hydraulic network is necessary to determine to which extent the benefits of a centralized wind farm compensate for the relatively lower efficiency.

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Figures

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Fig. 1

Schematic diagram of a single DOT

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Fig. 2

Diagram of a Pelton wheel

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Fig. 3

Subsystem block diagram of the wind turbine with fluid power transmission

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Fig. 4

Simplified diagram of flow in a Pelton

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Fig. 5

Torque-speed curve for passive control strategy

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Fig. 6

Simplified schematic for top: gearbox concept; bottom: hydraulic concept

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Fig. 7

Wind gust of 4 m/s in 10.5 s according to International Electromechanical Commission (IEC) standards, mean wind speed is 8 m/s

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Fig. 8

Transient response to a 4 m/s wind gust starting at t = 30 s

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Fig. 9

Hub height wind speed of 8 m/s with 17.67% TI

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Fig. 10

Transient response operation below rated wind speed

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Fig. 11

Generator platform operation below rated wind speed

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Fig. 12

Performance comparison below rated wind speed

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Fig. 13

Hub height wind speed of 15 m/s with 12% TI

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Fig. 14

Transient response operation above rated wind speed

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Fig. 15

Generator platform operation above rated wind speed

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Fig. 16

Performance comparison above rated wind speed

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Fig. 17

Distributed parameters pipeline representation

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Fig. 18

Torque- and power-speed curves for the different concepts

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Fig. 19

Power curves for the different concepts

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Fig. 20

Steady-state efficiency for the different concepts

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